It would be up to the Addon developer to do so.

The addon is copy-and-swap-fields. I have found it under Edit tags as per instructions, but I expected it to also be an icon on the toolbar. Not all addons can do that?

It depends on the Addon on how it is accessible in MediaMonkey. If it shows under Tools > Addons as installed it's available, you'll need to check with the Addon developer on how to use it.

Hi,
Lets first start what addons you do not see?

Switched to MM5 and have a number of questions. First one, I installed some addons, some of them appeared on the navigation bar, while others didn't appear either there or in Options – Tools – Available column. Where to look for them?